Betsy, Filiberto, Rai, Calum, Rich

We successfully repaired two elements (1&5) that were shorted by one of the wires that suspends the compensation plate (CP) on ITMY.  Rai machined two tools (2mm wide razor chisel and a carbide cutting tool fashioned into another tiny chisel) for us to use to remove a small portion of the gold mask on the CP.  The tools worked very well and we were able to cut two ~2mm gaps in the gold traces thus eliminating the short circuit path.

Everything went well.  After cutting the gaps, we checked that each wire had proper continuity from the airside of the vacuum feedthrough all the way to each pattern on the CP ESD mask.  From the airside of the vacuum feedthrough, each of the 5 center conductors were HIPOT tested at 1kV to chamber ground for 1 second with the tester set to alarm at 300uA.  The same HIPOT test was performed between each isolated shield and chamber ground.  All connections are normal.

There was a report of at least one problem with the 5-way coaxial connector on the vacuum side of the vacuum feedthrough that will require rework at a later date.  Once the majority of the doors are back on the chambers, there will be decent positive pressure such that the feedthrough can be taken off and the cable pulled through into the air and reworked in situ.  We have done this successfully on other similar connections.  Filiberto and I went through the necessary steps to repair that connector when the time is right.

Betsy is taking a couple of photos of the repair to be posted soon.